Application of Oxygen-Enriched Combustion in an Industrial Reheating Furnace Using CFD

AISTech 2021 Proceedings of the Iron and Steel Technology Conference Pub Date : 2021-11-01 DOI:10.33313/380/181

A. Silaen, C. Zhou, F. Martínez, J. Maiolo, K. Tian, K. Johnson, L. Fabina, B. Worl

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Abstract

The most energy intensive part of a hot rolling mill is the reheat furnace, where the steel products, the products are heated to target temperature using the combustion of natural gas. The energy consumption of the reheat furnace in a typical integrated steel mill is the second highest after blast furnace. Any improvement to energy efficiency of the reheat furnace can have significant impact on the overall energy efficiency of the steel plant. Oxygen enrichment of the combustion air beyond 21 vol% oxygen can be used to improve the furnace energy efficiency. The molar fraction of oxygen is increased, replacing nitrogen in the combustion air. In this study, computational fluid dynamics modeling of various burner configurations was conducted to investigate the application of oxygen enrichment or oxy-fuel to reduce fuel usage while maintain a given slab heating rate. The applications of medium oxygen enrichment (46 vol% O2) and oxy-fuel (100 vol% O2) in the preheating zone, which has the highest fuel usage of the three furnace zones, were investigated.

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利用CFD研究富氧燃烧在工业加热炉中的应用

热轧机中最耗能的部分是加热炉，在加热炉中，钢铁产品通过天然气的燃烧被加热到目标温度。某典型综合钢厂加热炉能耗仅次于高炉，位居第二。对加热炉能源效率的任何改进都会对钢厂的整体能源效率产生重大影响。燃烧空气中氧含量超过21 vol%可用于富氧，以提高炉子的能源效率。氧气的摩尔分数增加，取代了燃烧空气中的氮气。在本研究中，对不同燃烧器配置进行了计算流体动力学建模，以研究富氧或含氧燃料的应用，以减少燃料的使用，同时保持给定的板坯加热速率。研究了介质富氧(46 vol% O2)和含氧燃料(100 vol% O2)在三个炉区中燃料用量最高的预热区的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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AISTech 2021 Proceedings of the Iron and Steel Technology Conference

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